It depends on what kind of biscotti you're making. I price my cookies (everything except decorated sugar cookies) by adding up how much the ingredients cost per dozen, then doubling that number. My chocolate chip cookies cost about $3.25 a dozen to make, so I charge $6.50 a dozen (they're HUGE cookies - roughly two tablespoons of dough per cookie). I sell biscotti and nut rolls around the holidays. The nut rolls are $10 for a 12"roll and the biscotti go for between $6-$10 a dozen. The lower end dosen't have nuts or any type of decoration (i.e. one end dipped in chocolate and rolled in jimmies, or a chocolate drizzle), while the higher end contains nuts and decoration. I think eight dozen sounds about right. That's 96 biscotti, about 3 biscotti per person. If they're cut small and it's a group of big eaters, I'd probably make 9 dozen just to be safe. Good luck!